Ignition Timing

The time of occurrence of ignition measured in degrees of crankshaft rotation relative to TDC (Top Dead Centre).


The amount before the piston reaches the top of its travel that the spark fires to ignite the mixture. Expressed as degrees of engine rotation.

Ignition Delay

The length of time or number of degrees of crankshaft rotation between the beginning of injection and ignition of the fuel.

See also: Pre Ignition.

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Subjects: Engines